The Fortnite purple pistol chest bug has been reported by multiple players as it seems to reward players with shotguns and other varieties of weapons instead of a pistol. Epic Games added in specific weapon chests of a certain rarity. In this case, Redditor Ryan_201 found a purple pistol chest which should have had - prepare to be shocked - a purple pistol.
Instead, it had a purple shotgun. While the player isn't complaining about the upgrade, it does seem a bit unusual.
Fortnite Purple Pistol Chest Bug Rewards Players With Other Weapons
Epic Games made these chests to give players an opportunity to find specific loot in a chest, letting them weigh the risk of trying to open it or letting it go and fighting another day. But if you give players a chance at receiving a better weapon because of a glitch, it throws things out of whack.
Epic Games has yet to comment on the bug, but expect them to fix it fairly soon as it should be as simple as coding only specific legendary weapons, not a wide range of them.